Use an object to for privacy level models

This makes the association between the level key name and the display
text explicit and tight in the code.

h/static/scripts/directives/privacy.coffee

@@ -2,6 +2,18 @@ privacy = ['$window', ($window) ->
   VISIBILITY_KEY ='hypothesis.visibility'
   VISIBILITY_PUBLIC = 'public'
   VISIBILITY_PRIVATE = 'private'
+
+  levels = [
+    {name: VISIBILITY_PUBLIC, text: 'Public'}
+    {name: VISIBILITY_PRIVATE, text: 'Only Me'}
+  ]
+
+  getLevel = (name) ->
+    for level in levels
+      if level.name == name
+        return level
+    undefined
+
   # Detection is needed because we run often as a third party widget and
   # third party storage blocking often blocks cookies and local storage
   # https://github.com/Modernizr/Modernizr/blob/master/feature-detects/storage/localstorage.js
@@ -18,8 +30,6 @@ privacy = ['$window', ($window) ->
       setItem: (key, value) ->
         memoryStorage[key] = value
 
-  levels = ['Public', 'Only Me']
-
   link: (scope, elem, attrs, controller) ->
     return unless controller?
 
@@ -27,16 +37,16 @@ privacy = ['$window', ($window) ->
       return unless permissions?
 
       if 'group:__world__' in (permissions.read or [])
-        'Public'
+        getLevel(VISIBILITY_PUBLIC)
       else
-        'Only Me'
+        getLevel(VISIBILITY_PRIVATE)
 
     controller.$parsers.push (privacy) ->
       return unless privacy?
 
       permissions = controller.$modelValue
 
-      if privacy is 'Public'
+      if privacy.name is VISIBILITY_PUBLIC
           permissions.read = ['group:__world__']
       else
           permissions.read = [attrs.user]
@@ -49,22 +59,15 @@ privacy = ['$window', ($window) ->
 
     controller.$render = ->
       unless controller.$modelValue.read.length
-        visibility = storage.getItem VISIBILITY_KEY
-        level = if visibility is VISIBILITY_PUBLIC
-          'Public'
-        else
-          'Only Me'
+        name = storage.getItem VISIBILITY_KEY
+        level = getLevel(name)
         controller.$setViewValue level
 
       scope.level = controller.$viewValue
 
     scope.levels = levels
     scope.setLevel = (level) ->
-      visibility = if level is 'Public'
-          VISIBILITY_PUBLIC
-        else
-          VISIBILITY_PRIVATE
-      storage.setItem VISIBILITY_KEY, visibility
+      storage.setItem VISIBILITY_KEY, level.name
       controller.$setViewValue level
       controller.$render()
   require: '?ngModel'

h/templates/client/privacy.html

@@ -3,15 +3,16 @@
         role="button"
         class="dropdown-toggle"
         data-toggle="dropdown">
-        <i class="small" ng-class="{'h-icon-earth': level == 'Public', 'h-icon-locked': level == 'Only Me'}"></i>
-        {{level}}
+        <i class="small" ng-class="{'h-icon-earth': level.name == 'public',
+                                    'h-icon-locked': level.name == 'private'}"></i>
+        {{level.text}}
         <i class="h-icon-triangle"></i>
   </span>
   <ul class="dropdown-menu" role="menu">
-    <li ng-repeat="p in levels" ng-click="setLevel(p)">
-      <i class="small" ng-class="{'h-icon-earth': p == 'Public',
-                                  'h-icon-locked': p == 'Only Me'}"></i>
-      {{p}}
+    <li ng-repeat="level in levels" ng-click="setLevel(level)">
+      <i class="small" ng-class="{'h-icon-earth': level.name == 'public',
+                                  'h-icon-locked': level.name == 'private'}"></i>
+      {{level.text}}
     </li>
   </ul>
 </div>

tests/js/directives/privacy-test.coffee

@@ -42,7 +42,7 @@ describe 'h.directives.privacy', ->
         $element = $compile('<privacy ng-model="permissions">')($scope)
         $scope.$digest()
         $isolateScope = $element.isolateScope()
-        $isolateScope.setLevel('Public')
+        $isolateScope.setLevel(name: VISIBILITY_PUBLIC)
 
         $scope2.permissions = {read: []}
         $element = $compile('<privacy ng-model="permissions">')($scope2)
@@ -71,7 +71,7 @@ describe 'h.directives.privacy', ->
         $element = $compile('<privacy ng-model="permissions">')($scope)
         $scope.$digest()
         $isolateScope = $element.isolateScope()
-        $isolateScope.setLevel('Public')
+        $isolateScope.setLevel(name: VISIBILITY_PUBLIC)
 
         expected = VISIBILITY_PUBLIC
         stored = store.getItem VISIBILITY_KEY
@@ -94,14 +94,14 @@ describe 'h.directives.privacy', ->
           $isolateScope = $element.isolateScope()
 
         it 'sets the initial permissions based on the stored privacy level', ->
-          assert.equal $isolateScope.level, 'Public'
+          assert.equal $isolateScope.level.name, VISIBILITY_PUBLIC
 
         it 'does not alter the level on subsequent renderings', ->
           modelCtrl = $element.controller('ngModel')
           store.setItem VISIBILITY_KEY, VISIBILITY_PRIVATE
           $scope.permissions.read = ['acct:user@example.com']
           $scope.$digest()
-          assert.equal $isolateScope.level, 'Public'
+          assert.equal $isolateScope.level.name, VISIBILITY_PUBLIC
 
       describe 'when permissions.read is filled', ->
         it 'does not alter the level', ->
@@ -111,7 +111,7 @@ describe 'h.directives.privacy', ->
           $element = $compile('<privacy ng-model="permissions">')($scope)
           $scope.$digest()
           $isolateScope = $element.isolateScope()
-          assert.equal($isolateScope.level, 'Public')
+          assert.equal($isolateScope.level.name, VISIBILITY_PUBLIC)
 
       describe 'user attribute', ->
         beforeEach ->